Will A Thermos Keep Ice-Cream Frozen?

Ice cream is a delicious treat on hot days and is a popular addition to summer picnics to help beat the heat. You may have been considering ways to keep ice cream frozen for as long as possible. The solution is to use a thermos to keep drinks warm or cold for long periods. With some extra steps, you can keep ice cream frozen and solid in a thermos for up to 4 hours.

A thermos will keep ice cream frozen for up to 4 hours. The insulating material prevents heat from entering the thermos and keeps the ice cream from melting during hot summer days. Ice and aluminium foil can be placed in the thermos to keep it colder for longer. 

Not every thermos will work properly, though, as most of them can be unreliable and have poor cold retention. Many other steps can be taken to ensure your ice cream stays frozen for as long as possible.

Does A Thermos Keep Ice-Cream Frozen?

A good thermos will stop your ice cream from melting for up to 4 hours, depending on how cold the thermos is and how hot the temperature is outside. Even the best thermos will not keep ice cream frozen indefinitely, so you must ensure that you eat your ice cream as quickly as possible after taking it out of the fridge. 

How To Stop Ice Cream From Melting In A Thermos

The best way to keep ice cream frozen and solid in a thermos is by simply adding some ice cubes to the bottom of a thermos of your choice and adding the ice cream on top of the ice cubes. Make sure that the thermos lid is sealed so that no hot air gets into the thermos. 

Sealing the lid of your thermos will keep your ice cream frozen for anywhere from 30 minutes to 2 hours, and then you can enjoy your frozen summer treat anywhere you want, no matter the outside temperature. If you want to keep your ice cream frozen for even longer, you can perform a few additional steps to ensure a longer-lasting ice cream. 

Firstly, you can put the empty thermos in the freezer for a few hours to further cool the insulating material. This will make sure that it takes longer for the outside heat to penetrate the thermos and start to melt the ice cream. 

Secondly, you can add aluminum foil to the inside of the thermos to add an extra layer of insulation. This will keep the temperature of the ice cream consistent and make the thermos even more heat–resistant.

Doing all these steps will ensure that your ice cream stays frozen for up to 4 hours. Eventually, your ice cream will melt, so make sure you consume it quickly after taking it out of the fridge. Melted ice cream is certainly not enjoyable on a hot summer day. 

How Long Will A Thermos Keep Ice-Cream Frozen?

How long a thermos can keep ice cream frozen is dependent on various factors that influence the internal temperature of the flask. One of them is the thickness of the insulating material, which prevents hot air from entering the flask and causing the ice cream to melt.

How well the lid of the thermos closes is also a factor, as an ineffective lid can let hot air into the thermos and melt the ice cream. The various temperatures in and around the thermos are another factor that must be considered. 

The higher the external temperature, the faster the insulation in the thermos will heat up, leading to the ice cream melting. 

The internal temperature of the thermos determines how quickly the ice cream will melt, as a colder internal temperature takes longer to be heated up by the hot air on the outside of the thermos. 

With all these factors considered, ice cream in a thermos will stay frozen for anywhere between 30 minutes and 4 hours, based on the quality of the container and the outside temperature. However, it would be better if you tried to eat the ice cream as quickly as possible after removing it from the freezer. Ice cream can melt and possibly go bad even when placed in the highest quality thermos.

What Is The Best Thermos For Keeping Ice Cream Frozen?

While many brands and types of thermos are available, many are known to leak and are pretty ineffective at keeping ice cream frozen for long periods. It is essential to buy a good-quality thermos to ensure that problems don’t happen when you plan on taking your frozen treat out on a hot summer day.

Thankfully, a few brands are known for their high quality and reliability; luckily, a good quality thermos won’t cost too much. 

One of the best is the GSI Outdoors Glacier Stainless 1 L Vacuum Bottle, which is durable and has a sleek design that will allow you to hold a large amount of ice cream. It is more costly than other thermoses but is a worthwhile investment. 

Another good thermos is the Stanley Legacy Quadvac Thermal Bottle. It has exceptional cold retention and comes with a carrying handle, making it easier to carry than other thermoses. 

The downside is that it is quite hefty at 1 pound 14.4 ounces, making it bulkier than other thermoses on the market. It is more affordable than the previous thermos and closer to the average price for a decent thermos. 

There is also the Zojirushi Stainless Bottle SJ-TG08/10. It is smaller than the other thermoses, available in a 27 or 34-ounce model. It has excellent cold retention, but heat retention is not as good as the previous thermoses mentioned in case you want to use your thermos to hold ice cream and hot drinks.

It is durable and has a rugged design that is perfect for longer trips. It also has a carrying strap and a cup to scoop your ice cream into. This is handy as it eliminates the requirement for extra bowls and mugs.

Other good quality thermoses include:

  • Zojirushi Stainless Bottle SJ-TG08/10
  • Otterbox Rugged Mini Growler
  • Thermos Stainless King Beverage Bottle
  • Stanley Classic Legendary


A thermos is handy for keeping your ice cream frozen and enjoyable on a hot summer day. It’s convenient for picnics and other outdoor activities when you want to enjoy a delicious frozen treat to beat the heat. 

There are many good quality brands of thermos to choose from, with many of them having excellent cold retention to keep your ice cream frozen for as long as possible. It is a worthwhile investment as a good quality thermos will withstand even the hottest days in the summer. It will also keep your hot drinks from getting cold so that you can get good value for your money. 


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